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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '135aedcb2133be59f55a46906befe1c6a34cc1be8a083fb8da82bea1f39cb885' 
  AND token = 'SB2ZBCYswOEu+FTOADfBOdBB+UJieHA0DGLIxJVih9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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