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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9c0c894b5a967cdbbd6e876bb04053ecc51bf028623f82c156589d6ba0d21ef' 
  AND token = 'iXp4QTk6rOBxqv3iTYVe/xYQ1udbyri4iCHn8AZbXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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