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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bff89ed4218681518c8e0a9c296c0beee6679122e9616d49339d4a4e321a5df' 
  AND token = '1TgfnuaeLH62wTPn6O4FjFEH0ZnWRuDea5ejS5P5/2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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