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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bd7789348a6b7dd2d5ba3c53a46b3492dd6ed7f5c76d39f776a50d3d428cf6f' 
  AND token = 'SmuEK1w8M1iux2Xxkkn64i1x5v7Nw/cJukfGJm6YKjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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