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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d9009666db90fe2ed59130b6dce1f14e4d1bdb5992b3ff1f91ed396526de74c' 
  AND token = 'rJJUmwqw0Sfb4pcjDzz7H/x04m8ezQWqFugAnRZ6ekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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