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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb7e87088f1195cd2200395040002f6f63bf5368ccf6920f718317865d6def4a' 
  AND token = 'KyOfJ97J8ufDAEIEC9GP90ld+WHvtW1olPVezUemv8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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