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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7a86e3f0fe19e1759353763627079cc7fa9a17cfa8ba152ab11d7ae671fc78' 
  AND token = 'AouK7fnMK1g++GeTdCTw3dMVCyz+/L/8EP94t2BYCt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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