SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f119cc42994c6f8689db70e94b72ba46646f2578fa786104821c868357a3ecc' 
  AND token = 'w8kDqEVIABLFTdHvVii+j9HL2yA9UgsF2OeUT7hyltU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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