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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c5bd7a7759d93f1bf8583e7c976b81fc57b2743e4b062e1b4ac9890e5d08bc' 
  AND token = 'wbM78Uv+6S84McYe1eqNQzvOWvkSHZ07er1X0N5f6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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