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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff4281abdf4451e8a9a9de5fec343f352baa0c7d26a1e142c1de9c50e39b80f' 
  AND token = '7lGZKfKt20wi7Bybq4IH+WaRG15tG1wRW127DNe370w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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