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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcc84d28e4f53eab8599ed2c18bf8122c2d2282e9541e5ea342f3b94bffa0ee1' 
  AND token = 'frJpznM7q2NeZW4rbMqKSf22dHvnh7NWDbePoQ7m5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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