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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d14779d81f5095aa9349732e83f560796e2986b76f7566e825aaa6131a8bbe8' 
  AND token = '1r6Fo6pydPRrrNpPT9IRBuXE3hucSRM4b0HaOqjxw8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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