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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f239b783326d4eae77dbaeb0347b0a276dbd37c1adb6697b5f4dd82c688b3f2' 
  AND token = 'bqSHwJ7j3IJevuskG5iBpsQnmI9+UsK95rewsPkJubs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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