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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fddf209408ccfb6d6481921339f358a733d62baec90098fff6d02d64e360396' 
  AND token = 'ACxEenGwKY6aGas5xhl0hIcJpywSqDnfNMM4s4AbwVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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