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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96d849fdfb433c6a8b758b046bb0e71f42d650d0a4a0e5a3ed3005a4ff179eea' 
  AND token = '1mcaVJTN7HAZ3mek+fySDjqgx89p1mjxQ61E/Wwgr/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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