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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c4b567907160ce57aa7c7f78cfb5f73db91ffda4fa6aa21c4a512250531024b' 
  AND token = 'fbEC1CdHhQlYV07OM08yqgNT/XcOF2NCEsF1oN9xH1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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