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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '403b8a0616b97cb7ff1bd650412f9fb03e19007ef74ec2b017ed189631825a4f' 
  AND token = 'x2bM0tnp3X/1CUApqoa7DcqzpQ5mJNNJSHSIiXngEIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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