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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c635976ae338d534c9e7c4b2721f0d450e5dd4ee390780214d3eb0e055b9a95d' 
  AND token = 'bXDUiWlzBtrWAhkr9izH26DRnvsxDxvCqMfbiIHoqAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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