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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f5d6891559cd98bfbda2535962f2758f28155b855a69a7b6dfce37de0e916b0' 
  AND token = 'pY0EqrSsk26KNBtUyVRYy/6QF4C841NtW1jd697L2Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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