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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14e7904384cb85982c839272a34b7afe1501800a68944d8acfba0e7f0755237c' 
  AND token = 'LgZXpoFPXsfwie71iuvpPW/ZS7RtVE183A6PpOv3cc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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