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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31a075c05b4d8292deb37cd71f672896817830d06fd1d9cef4aa03e8c366d056' 
  AND token = 'jrlE1SPCtYQyBNJSIoFWXCCCdDSV12v+uUPaArIHYEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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