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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3badfb782605481f5a1c5c715321a4f907403848ee695936d80947f10e2f1592' 
  AND token = 'u1Srdr85f1lis08heGv6gOZo9W8yPlQqCGXF8G0t9dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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