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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c128b8346823b90d02cb5b99542c8d658a00e44a7e87127f889a13e81de92f75' 
  AND token = '7m7Sf6StKSjDUHMCL/EHOdab0RnhIwtynrpse066G9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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