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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d268324931eba5ced2d439eb72547f439c5dbf4d375b4f7c81d676dce339e33' 
  AND token = 'cesS8RP+xV+8q5tgUZLC5rA1yTtTI6yLy1/vghsiwok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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