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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25fb67d8c061c0dae93fea577ff932b2d6e67cf15a51014cc8bcaef12c03a169' 
  AND token = 'QKghiqc+RKcmDnLVKW6kd9qNyUWu3w1AJmfi5OxHGE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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