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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8100716e3feada6fadc7ca87fe91b9199c226dc33478ab03291bdf8cd6d2740a' 
  AND token = 'Mngde27jgw4WdVxIHaG+WW1dJm9gBYAcLsNUVrIBAt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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