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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ab9e5a54c1fe9f0be14f04b3286653b1b95d850fc747853ee9e1583336a5917' 
  AND token = 'KBC8ntC/5nj/6iJ2y3luI586E09UIzQMRjLV8MHZtQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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