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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bbf037d63c57e58a86b6d5d4dd769ac3de21e45c6916a8ccb2579ec4d418e0b' 
  AND token = 'vnwp8g/0Fti6q0X1dBvx6yjhlEFROJADJCeLvNbM97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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