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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ccf6082dfc7f08b5ec03c768612de4202d72ff5afc89fab913bb3d9e4a69e1' 
  AND token = 'EeBaM6Ew4SQ/91XY0O+UStZKPJl9Sl6lBTRxEOMwAgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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