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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d7c3a2728ea0b1c5898c5643d5abcb605207961c0c3be166df731e09f5b3c7a' 
  AND token = 'aHrE2xsBsWAVGzuqldgLqLxpziggPFaaCjwau8OgEiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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