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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7251fcbced9fc7ee9e8f8a74a029eec533d2ce25aad376436df61ce70ba0f604' 
  AND token = 'UNz3begzA1h51e02OX0CDirgddT7YtYQ5V2LdB9vPQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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