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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcef1e9946e3811979361ac9beda468f597274c8cb75926af0f0562c902da0ad' 
  AND token = 'mSPLcxvgLSpMnUimuTkj6H8vft/Bd1ZI8Ksv69Rteqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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