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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4382e1922e2dfc1f21168b0a7711da98178c44ed4d28ed80c5fd50bbef63e3' 
  AND token = 'EL3TxUWCph6fRyb83MekvNX4jxQhtO7Vw2PzW/hDgEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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