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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd66f7abf777379d6e9e23e12a375be3614235270950f412289ee1b144d153cc3' 
  AND token = '5dOSvvAD7xcVo6yrHK3J12VRJeVlzkiI49QmBtISVJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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