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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04bb2339415d299a36e2f87e85b55e25db45f239c265b5d0ada3e8b4059dabcb' 
  AND token = '6tOOxwP/Eg24f5/zmkno1bsPMtnvO0LS5hyuQb2elq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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