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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ec2e09b158eec7b35364c3d0732a9a5976bc107a0a81340f9aa1f92b361492' 
  AND token = 'utbB+SOnhH7KXnbB3Bdm4kmUFJQX68UQ4sx3UdMC7N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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