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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93fc8e97309411cbbb6dcba87d4126faaeeef1898affbe43cac9e3f8b3980b8b' 
  AND token = '8bq6mFtq/XVRIKHDPl2yFam5/K1n6SRBbg9kI3Fz23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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