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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e72fcda2ea90c027eb15da3a65afa2b5394ce4e174d3c341cf022402100fa47' 
  AND token = 'cXoZzFmbpW+5nDpPQDPkORhf0yOIBVVFR0gSujKax1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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