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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89b5c74a7ce098996bae3adb1455a4614434520adc3468b6f666aa2361b99c6' 
  AND token = '6YrXsAiyldqxS7iWNHFljgDVvB+PCMDdeb4VL6SZdYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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