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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9697076bc7fdc31c426859e347c499426444df8909dc0cc1166bf7db0588cad' 
  AND token = 'ZU4SI2QeBIejHwX4clpke02zcfbqhXA1j/2L2pYNE/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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