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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6c14a34bf3add7321f2e092d1ea9e23efb94215aecb19fa0887330e897a3864' 
  AND token = 'OzNJ9aZxkb2rFBMqRWs9VYEDf9990FUwk1h4tZW7uXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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