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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7885630971282f9bc0be448d05b9a08d323a464a07c584b077d38ca9b3fc66bf' 
  AND token = 'ojv/CCjSmr+TmOSMxEM80b9ou249zBk3tKuGUORO52M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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