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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '360f6f4e1f3fd96dd0b1a5b09f90d8006e3aba2df79be63b2a8989a3e5f0ed61' 
  AND token = 'a30CX4VyIe5mMAEdsx7jzz4cjFflLBy6SlQGybWeKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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