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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c57396f29fa0651b0355f452c9ba559bfa0959bfd396955093c58556edc8c81' 
  AND token = 'vLfb8soLn8hiFsIhSX9W1TiDiszm/YyDllLAtbFJeVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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