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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8568f5d726684f3179f5e9175fe0af09570271572b3641a84c70cb542a36d702' 
  AND token = 'G1LflPE6Z7URhhIysK6nK1F0omCy6tomp2SIVsGiaJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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