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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '307adaf80cfa251c26d047c2deab64fec844e716918cf558e0d7b22ef2b39b80' 
  AND token = 'KHGbKYSstBjAOEae2VMh1WmibE3F84PzoQV6UwDu8AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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