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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6e0d929c2a7700561762368a4fa797c50f1a999532901f4743aa8d10fa4282e' 
  AND token = '2DpvZ6LV3OF12blAwwWCSFz+kdOM+Zn5u4LIa5TLNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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