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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ed902c92e059fc065c19a33e31e06746fb34c99bf4f81c437a805a8cab10a2' 
  AND token = 'RP0Sed+5JHkC9HMSPbwr5hqJN24CyJ/wGMfjkmVqpUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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