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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4bde14ef1ae6a680fae738ee2a6ec82c5c1148958ff183367a8d0db2a2470ef' 
  AND token = 'KFJMIohzqZtAozf9K4GWhysuNrrGyCn9qm9n6/YoDWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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