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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2cd09b98cf008d78ada19f0efb4bbb29839868133bcbe64fd60ec752588a0e' 
  AND token = '1MQ2QKhpS7xoS02WudLp48cX+RAcU/8i/2dztZV3lwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}