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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc04672fdc24782454c06f8fb9aa7ad2d4496beb6336f75f5def5f9eb9b68cf1' 
  AND token = 'qX47OK3/97DsGilhiybIY6S0d2tpmlyXA7IXUOCS2Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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