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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc66ce9c0f1b5eaaf25d762300a5cffbe9195acd8fbee77cf984ffa5fe41b381' 
  AND token = 'oge/qYq0iDdYqiVvHv2U429CpTRJpkT0gW9Bfy4G9kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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