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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5acdb7d641e88dd8b83df6954412e79f1645de37af8046d462ba3adf7c9b0dea' 
  AND token = 'GShxM8TOHW+4nFyy1ehrs1y4zP3Q9UJMOUqwtuyQyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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