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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c6531ae33b0247945dd35ba3e7229729e665cb7693eaf20eef080a2c6289328' 
  AND token = '/j3ANzsh67c7Xa5ua1pRWBjoFCESslPAu5Y0Y0BlefA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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