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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75465541ee9e4db5b722d50dbad02aac5c4d15abb7c3b296a0d3f1b5886fc3ee' 
  AND token = 'gjP8GhnffsywFZTWmoAj7dM3gqwLIzmm7kkN4mzd92I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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