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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '854c9438f686748efd7d12296f1209b881faa2e6fa291796eed960c3d095f564' 
  AND token = '3Oi+dGeiqyhYqOWQ6steZRIns98bL3c6MrcnfU5MMEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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