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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9757d761f3da170b9aa8ae3a82d95384113961a3fed9abdeb2fdc84c9baff629' 
  AND token = 'terNcZBEKVRBbI6u42Vv6kRcKOhY9x+N9ySwzr+iykA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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