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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52815d97a8f714cdfddc4d1e0e18493e170c3bfae73f1cf3dac097c4e6e1ce0f' 
  AND token = '75+YtfykTQ4hTc/PuZ/vG30+YKC91qZQrMGogZZPyBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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