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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72d78b9b60eec0fa24bf997a784c5f8dca2b3c2ed65d507e88bcf5cc818ee909' 
  AND token = 'CbPx11htkGfs2+a4Z9Bw0zSiJa6j8FkDGyJm4Luxb+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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