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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7923af5d03c5c738e3dceeadee9e3402dd9286d63c74ca3a038cb3dd74356689' 
  AND token = 'qHoLIkt5gAaiiI23V+SPvShUoF3Av0mrZ1aCDbJ0H7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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