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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2d7516ae064a2409b5d8105207d02e532f80c0815dd65efb58d8d8e4440957e' 
  AND token = '/my6LMExyphayZQvUlCIXorkxJ0qPS3uDmdv5bDygsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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