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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5fe6334a14ff9f91da22f07133861716615760b4c06cb9c3334d845b69d107b' 
  AND token = 'JRza7s4o3rWFbWaK4Db9oWmrRB5AgUy+v8liYBseoRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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